Tokyo (CNN) -- Even as workers began to see some success in  their battle to cool down reactors at the Fukushima Daiichi nuclear  plant, Japanese officials said Sunday that they would have to release  some radioactive gas into the air.
The country's nuclear safety agency said releasing the gas was a necessary step to reduce mounting pressure in reactor No. 3's containment vessel -- the steel and concrete shell that insulates radioactive material inside.
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The country's nuclear safety agency said releasing the gas was a necessary step to reduce mounting pressure in reactor No. 3's containment vessel -- the steel and concrete shell that insulates radioactive material inside.
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